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Drop in fuel economy??

874 views 2 replies 2 participants last post by  coal_burner07 
#1 ·
2007 SCLB, SRW with 76k. I always got around 16mpg during the summer months but this summer I could barely get over 13mpg. Nothing has changed and no work has been done on the truck. It does have an egr delete, studs, 4" turbo back exhaust, and im using an stc tuner running the xtreme street tune from innovative. The air filter is stock and the indicator hasnt moved so im assuming its not restricted. The only thing I have noticed is if you are going up a hill and ease into the gas to keep your speed it doesnt boost right away, it will rumble a bit, then blow a decent puff of black smoke, then the turbo spools up and it goes. Any ideas?
 
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